Fan-out type semiconductor package and method of manufacturing the same

ABSTRACT

A fan-out type semiconductor package may include a frame, an upper chip stack, a first redistribution pattern, a lower chip stack, a second redistribution pattern and a redistribution post. The frame may have a cavity. The upper chip stack may be arranged in the cavity. The first redistribution pattern may be arranged under the frame. The first redistribution pattern may be electrically connected with the upper chip stack. The lower chip stack may be arranged under the first redistribution pattern. The second redistribution pattern may be arranged under the lower chip stack. The second redistribution pattern may be electrically connected with the lower chip stack. The redistribution post may be electrically connected between the first redistribution pattern and the second redistribution pattern. Thus, the fan-out type semiconductor package may have an improved heat dissipation characteristic with a thin thickness.

CROSS-RELATED APPLICATION

A claim of priority under 35 USC § 119 is made to Korean PatentApplication No. 10-2020-0000056, filed on Jan. 2, 2020 in the KoreanIntellectual Property Office (KIPO), the contents of which are hereinincorporated by reference in their entirety.

BACKGROUND

Example embodiments relate to a fan-out type semiconductor package and amethod of manufacturing the same. More particularly, example embodimentsrelate to a fan-out type semiconductor package that may, for example, beused in a smart phone, and a method of manufacturing such a fan-out typesemiconductor package.

In smart phone and similar applications, a package-on-package (POP)device may be used in which an upper package of the POP device includesmemory chips and a lower package of the POP device includes a logicchip. The memory chips may be electrically connected with an upperpackage substrate of the upper package via conductive wires. The POPdevice may be relatively thick since the conductive wires may be moldedby a molding member. In order to reduce the thickness of the POP device,the thickness of the logic chip may be decreased. However, reducing thethickness of the logic chip can disadvantageously result in a reducedcapability of the POP device to sufficiently dissipate heat.

SUMMARY

According to example embodiments, there may be provided a fan-out typesemiconductor package. The fan-out type semiconductor package mayinclude a frame, an upper chip stack, a first redistribution pattern, alower chip stack, a second redistribution pattern, and a redistributionpost. The frame may have a cavity. The upper chip stack may be arrangedin the cavity. The first redistribution pattern may be arranged underthe frame. The first redistribution pattern may be electricallyconnected with the upper chip stack. The lower chip stack may bearranged under the first redistribution pattern. The secondredistribution pattern may be arranged under the lower chip stack. Thesecond redistribution pattern may be electrically connected with thelower chip stack. The redistribution post may be electrically connectedbetween the first redistribution pattern and the second redistributionpattern.

According to example embodiments, there may be provided a fan-out typesemiconductor package. The fan-out type semiconductor package mayinclude a frame, an upper chip stack, a first redistribution pattern, afirst upper post, a second upper post, an upper molding member, a lowerchip stack, a second redistribution pattern, a first lower post, asecond lower post, a redistribution post, and a lower molding member.The frame may have a cavity. The upper chip stack may include a firstupper chip and a second upper chip. The first upper chip may be arrangedin the cavity. The second upper chip may be stacked on an upper surfaceof the first upper chip in a step-like shape. The second upper chip mayhave a size substantially the same as a size of the first upper chip. Anedge portion of the first upper chip, which may not be overlapped withthe second upper chip, may be exposed. An edge portion of the secondupper chip, which may not be overlapped with the first upper chip, maybe exposed. The first upper chip may include a first upper pad arrangedon a region of a lower surface of the exposed portion of the first upperchip. The second upper chip may include a second upper pad arranged on aregion of a lower surface of the exposed portion of the second upperchip. The first redistribution pattern may be arranged under the frame.The first upper post may be downwardly extended from the first upperpad. The first upper post may be connected to the first redistributionpattern. The second upper post may be downwardly extended from thesecond upper pad. The second upper post may be connected to the firstredistribution pattern. The upper molding member may be formed on thefirst redistribution pattern to support the upper chip stack and thefirst and second upper posts. The lower chip stack may include a firstlower chip and a second lower chip. The first lower chip may be arrangedunder the first redistribution pattern. The second lower chip may bestacked on an upper surface of the first lower chip in a step-likeshape. The second lower chip may have a size substantially the same as asize of the first lower chip. An edge portion of the first lower chip,which may not be overlapped with the second lower chip, may be exposed.An edge portion of the second lower chip, which may not be overlappedwith the first lower chip, may be exposed. The first lower chip mayinclude a first lower pad arranged on a region of a lower surface of theexposed portion of the first lower chip. The second lower chip mayinclude a second lower pad arranged on a region of a lower surface ofthe exposed portion of the second lower chip. The second redistributionpattern may be arranged under the lower chip stack. The first lower postmay be downwardly extended from the first lower pad. The first lowerpost may be connected to the second redistribution pattern. The secondlower post may be downwardly extended from the second lower pad. Thesecond lower post may be connected to the second redistribution pattern.The redistribution post may be electrically connected between the firstredistribution pattern and the second redistribution pattern. The lowermolding member may be formed on the second redistribution pattern tosupport the lower chip stack, the first and second upper posts, and theredistribution post.

According to example embodiments, there may be provided a method ofmanufacturing a fan-out type semiconductor package. In the method ofmanufacturing the fan-out type semiconductor package, an upper chipstack may be arranged in a cavity of a frame. A first redistributionpattern electrically connected with the upper chip stack may be formedunder the frame. A lower chip stack may be arranged under the firstredistribution pattern. A second redistribution pattern electricallyconnected with the lower chip stack may be formed under the lower chipstack. A redistribution post may be electrically connected between thefirst redistribution pattern and the second redistribution pattern.

According to example embodiments, the upper chip stack may be arrangedin the cavity of the frame in the step-like shape and the step-likelower chip stack may also be arranged under the upper chip stack. Thus,the fan-out type semiconductor package may have an improved heatdissipation characteristic with a thin thickness.

BRIEF DESCRIPTION OF THE DRAWINGS

Example embodiments will be more clearly understood from the followingdetailed description taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 is a cross-sectional view illustrating a fan-out typesemiconductor package in accordance with example embodiments;

FIGS. 2A and 2B are bottom views illustrating stack configurations of anupper chip stack of the fan-out type semiconductor package shown in FIG.1;

FIGS. 3 through 14 are cross-sectional views for reference in describinga method of manufacturing the semiconductor package shown in FIG. 1;

FIG. 15 is a cross-sectional view illustrating a fan-out typesemiconductor package in accordance with example embodiments;

FIG. 16 is a cross-sectional view illustrating a package including alogic chip connected with the fan-out type semiconductor package shownin FIG. 15;

FIG. 17 is a cross-sectional view illustrating a fan-out typesemiconductor package in accordance with example embodiments; and

FIG. 18 is a cross-sectional view illustrating a logic chip applied tothe fan-out type semiconductor package shown in FIG. 17.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Hereinafter, example embodiments will be explained in detail withreference to the accompanying drawings.

FIG. 1 is a cross-sectional view illustrating a fan-out typesemiconductor package in accordance with example embodiments.

Referring to FIG. 1, a fan-out type semiconductor package 100 of exampleembodiments may include a frame 110, an upper chip stack 140, an uppermolding member 180, a first redistribution pattern 190, a lower chipstack 170, a lower molding member 182, a second redistribution pattern210, a redistribution post 200 and external terminals 220.

The frame 110 may include a core insulation layer 112 and a cavity 114.The cavity 114 may be formed through a central portion of the coreinsulation layer 112 in a vertical direction.

The upper chip stack 140 may be arranged in the cavity 114. The upperchip stack 140 may include a first upper chip 120 and a second upperchip 130. The second upper chip 130 may be stacked on an upper surfaceof the first upper chip 120. The first and second upper chips 120 and130 may include memory chips.

The first upper chip 120 may include a plurality of first upper pads122. The first upper pads 122 may be arranged on a lower surface of thefirst upper chip 120. The second upper chip 130 may include a pluralityof second upper pads 132. The second upper pads 132 may be arranged on alower surface of the second upper chip 130.

In example embodiments, the first upper chip 120 may have a size whichmay be substantially the same as a size of the second upper chip 130.Thus, the first upper chip 120 may have a surface area and a thicknesswhich may be substantially the same as a surface area and a thickness ofthe second upper chip 130. Alternatively, in other embodiments, thefirst upper chip 120 may have a surface area and/or a thickness whichmay be different from a surface area and a thickness of the second upperchip 130.

Further, the first upper chip 120 may have a lower surface which may besubstantially coplanar in a horizontal plane with a lower surface of theframe 110. The second upper chip 130 may have an upper surfacesubstantially coplanar in a horizontal plane with an upper surface ofthe frame 110. Alternatively, the lower surface of the first upper chip120 may be positioned on a horizontal plane that may be different from ahorizontal plane on which the lower surface of the frame 110 may bepositioned. That is, the lower surface of the first upper chip 120 maybe positioned on a horizontal plane that may be higher or lower than ahorizontal plane on which the lower surface of the frame 110 may bepositioned. Further, the upper surface of the second upper chip 130 maybe positioned on a horizontal plane that may be different from ahorizontal plane on which the upper surface of the frame 110 may bepositioned. That is, the upper surface of the first upper chip 130 maybe positioned on a horizontal plane that may be higher or lower than thehorizontal plane on which the upper surface of the frame 110 may bepositioned.

FIGS. 2A and 2B are bottom views illustrating stack configurations ofthe upper chip stack 140 of the fan-out type semiconductor package shownin FIG. 1.

Referring to FIG. 2A, in one example the first upper pads 122 may bearranged adjacent one edge only of the first upper chip 120, and thesecond upper pads 132 may be arranged adjacent one edge only of thesecond upper chip 130. In addition, the second upper chip 130 may bestacked on the first upper chip 120 in a laterally offset manner so asto downwardly expose the second upper pads 132. As a result, the upperchip stack 140 has a step-like shape. In addition, the orientation ofthe first upper chip 120 may be rotated 180° relative to that of thesecond upper chip 130 such that the first upper pads 122 may be locatedalong an opposite edge of the upper chip stack 140 relative to thesecond upper pads 132.

Referring to FIG. 2B, in another example the first upper pads 122 may bearranged adjacent two connecting edges only of the first upper chip 120,and the second upper pads 132 may be arranged adjacent two connectingedges only of the second upper chip 130. In addition, the second upperchip 130 may be stacked on the first upper chip 120 in a diagonallyoffset manner so as to downwardly expose the second upper pads 132. As aresult, the upper chip stack 140 has a corner step-like shape. Inaddition, the orientation of the first upper chip 120 may be rotated180° relative to that of the second upper chip 130 such that the firstupper pads 122 may be located along an opposite corner of the upper chipstack 140 relative to the second upper pads 132.

In the example embodiments of FIGS. 2A and 2B, the upper chip stack 140includes a stack of two chips 120 and 130. In alternative embodiments,the upper chip stack 140 includes three or more stacked chips.

Referring again to FIG. 1, a first upper post 142 may be downwardlyextended from the first upper pads 122 of the first upper chip 120. Thefirst upper post 142 may be formed by a plating process. In exampleembodiments, the first upper post 142 may include a metal such ascopper.

A second upper post 144 may be downwardly extended from the second upperpads 132 of the second upper chip 130. The second upper post 144 mayhave a lower end substantially coplanar with a lower end of the firstupper post 142. The second upper post 144 may be formed by a platingprocess. In example embodiments, the second upper post 144 may include ametal such as copper.

The upper molding member 180 may be formed on the lower surface of theframe 110 to fill up the cavity 114. Thus, the upper molding member 180may be configured to surround the first and second upper chips 120 and130 and the first and second upper posts 142 and 144. The lower ends ofthe first and second upper posts 142 and 144 may be exposed through alower surface of the upper molding member 180.

A first insulation layer 192 may be formed on the lower surface of theupper molding member 180. The first insulation layer 192 may include aphotoimageable dielectric (PID). The first redistribution pattern 190may be formed in the first insulation layer 192. The firstredistribution pattern 190 may be extended to a fan-out region beyondthe upper chip stack 140. The first redistribution pattern 190 mayinclude an upper end exposed through an upper surface of the firstinsulation layer 192 and a lower end exposed through a lower surface ofthe first insulation layer 192. The lower ends of the first and secondupper posts 142 and 144 may be connected to the upper end of the firstredistribution pattern 190 exposed through the upper surface of thefirst insulation layer 192.

In example embodiments, the first insulation layer 192 and the firstredistribution pattern 190 may have a single-layered structure.Alternatively, the first insulation layer 192 and the firstredistribution pattern 190 may have a multi-layered structure.

The lower chip stack 170 may be arranged in the lower surface of thefirst insulation layer 192. The lower chip stack 170 may include a firstlower chip 150 and a second lower chip 160. The first and second lowerchips 150 and 160 may include memory chips.

The first lower chip 150 may include a plurality of first lower pads152. The first lower pads 152 may be arranged on a lower surface of thefirst lower chip 150. The second lower chip 160 may include a pluralityof second lower pads 162. The second lower pads 162 may be arranged on alower surface of the second lower chip 160.

In example embodiments, the first lower chip 150 may have a sizesubstantially the same as a size of the second lower chip 160. Further,the size of the first and second lower chips 150 and 160 may besubstantially the same as the size of the first and second upper chips120 and 130.

The second lower chip 160 may be stacked on an upper surface of thefirst lower chip 150. That is, an upper surface of the second lower chip160 may be configured to make contact with the lower surface of thefirst insulation layer 192. The first and second lower chips 150 and 160may be stacked in the step-like shape in FIG. 2A or the pyramidalstep-like shape in FIG. 2B. Thus, any further illustrations with respectto the stack structure of the first and second lower chips 150 and 160may be omitted herein for brevity.

In example embodiments, the lower chip stack 170 may include the twostacked chips 150 and 160. Alternatively, the lower chip stack 170 mayinclude at least three stacked chips.

A first lower post 172 may be downwardly extended from the first lowerpads 152 of the first lower chip 150. The first lower post 172 may beformed by a plating process. In example embodiments, the first lowerpost 172 may include a metal such as copper.

A second lower post 174 may be downwardly extended from the second lowerpads 162 of the second lower chip 160. The second lower post 174 mayhave a lower end substantially coplanar with a lower end of the firstlower post 172. The second lower post 174 may be formed by a platingprocess. In example embodiments, the second lower post 174 may include ametal such as copper.

The redistribution post 200 may be downwardly extended from the lowerend of the first redistribution pattern 190 in the fan-out regionexposed through the lower surface of the first insulation layer 192. Theredistribution post 200 may have a lower end substantially coplanar withthe lower ends of the first and second lower posts 172 and 174. Theredistribution post 200 may be formed by a plating process. Theredistribution post 200 may include a metal such as copper.

The lower molding member 182 may be formed on the lower surface of thefirst insulation layer 192. Thus, the lower molding member 182 may beconfigured to surround the first and second lower chips 150 and 160 andthe first and second lower posts 172 and 174. The lower ends of thefirst and second lower posts 172 and 174 and the lower end of theredistribution post 200 may be exposed through a lower surface of thelower molding member 182.

A second insulation layer 212 may be formed on the lower surface of thelower molding member 182. The second insulation layer 212 may include aPID. The second redistribution pattern 210 may be formed in the secondinsulation layer 212. The second redistribution pattern 210 may includean upper end exposed through an upper surface of the second insulationlayer 212, and a lower end exposed through a lower surface of the secondinsulation layer 212. The lower ends of the first and second lower posts172 and 174 and the lower end of the redistribution post 200 may beconnected to the upper end of the second redistribution pattern 210exposed through the upper surface of the second insulation layer 212.

In example embodiments, the second insulation layer 212 and the secondredistribution pattern 210 may have a single-layered structure.Alternatively, the second insulation layer 212 and the secondredistribution pattern 210 may have a multi-layered structure.

The external terminals 220 may be mounted on the lower ends of thesecond redistribution pattern 210 exposed through the lower surface ofthe second insulation layer 212. The external terminals 220 may includesolder balls.

Further, a protection layer 230 may be formed on the upper surfaces ofthe frame 110 and the upper chip stack 140. The protection layer 230 mayinclude an insulation layer such as epoxy resin. Additionally, a heatspreader may be arranged on an upper surface of the protection layer230.

FIGS. 3 and 14 are cross-sectional views illustrating a method ofmanufacturing the semiconductor package in FIG. 1.

Referring to FIG. 3, the first and second upper chips 120 and 130 may bestacked in the step-like shape or the pyramidal step-like shape to formthe upper chip stack 140. The first upper post 142 may be formed on thefirst upper pads 122 of the first upper chip 120 by the plating process.The second upper post 144 may be formed on the second upper pads 132 ofthe second upper chip 130 by the plating process. The first upper post142 may have a length substantially the same as a length of the secondupper post 144. Thus, the lower end of the first upper post 142 may bepositioned on a plane lower than a plane where the lower end of thesecond upper post 144 may be positioned.

The upper chip stack 140 may be arranged in the cavity 114 of the frame110 using a tape 250. Particularly, the tape 250 attached to the upperchip stack 140 may be attached to the upper surface of the frame 110 toposition the upper chip stack 140 in the cavity 114 of the frame 110.The tape 250 may include polyimide.

Referring to FIG. 4, after removing the tape 250, a carrier substrate260 may be attached to the upper surface of the frame 110. The uppermolding member 180 may be formed on the lower surface of the frame 110to fill the cavity 114 with the upper molding member 180.

Referring to FIG. 5, the lower surface of the upper molding member 180may be removed by a grinding process until the lower end of the secondupper post 144 may be exposed. Because the lower end of the first upperpost 142 may be lower than the lower end of the second upper post 144,the first upper post 142 may be partially removed by the grindingprocess. As a result, the lower ends of the first and second upper posts142 and 144 may be exposed through the lower surface of the uppermolding member 180.

Referring to FIG. 6, a first redistribution layer (RDL) 194 may beformed on the lower surface of the upper molding member 180. The firstRDL 194 may be connected to the lower ends of the first and second upperposts 142 and 144 exposed through the lower surface of the upper moldingmember 180.

Referring to FIG. 7, the first RDL 194 may be etched to form the firstredistribution pattern 190. The first redistribution pattern 190 mayconnected to the lower ends of the first and second upper posts 142 and144.

Referring to FIG. 8, the first insulation layer 192 may be formed on thelower surface of the upper molding member 180 to cover the firstredistribution pattern 190 with the first insulation layer 192. Thefirst insulation layer 192 may be patterned using an exposure process toexpose the first redistribution pattern 190.

Referring to FIG. 9, the redistribution post 200 may be formed on thefirst redistribution pattern 190 exposed through the first insulationlayer 192. The redistribution post 200 may be formed by the platingprocess.

Referring to FIG. 10, the first and second lower chips 150 and 160 maybe stacked in the step-like shape or the pyramidal step-like shape toform the lower chip stack 170. The first lower post 172 may be formed onthe first lower pads 152 of the first lower chip 150 by the platingprocess. The second lower post 174 may be formed on the second lowerpads 162 of the second lower chip 160 by the plating process. The firstlower post 172 may have a length substantially the same as a length ofthe second lower post 174. Thus, the lower end of the first lower post172 may be positioned on a plane lower than a plane where the lower endof the second lower post 174 may be positioned.

The lower chip stack 170 may be attached to the lower surface of thefirst insulation layer 192. That is, the upper surface of the secondlower chip 160 in the lower chip stack 170 may be attached to the lowersurface of the first insulation layer 192.

Referring to FIG. 11, the lower molding member 182 may be formed on thelower surface of the first insulation layer 192 to cover the lower chipstack 170, the first and second lower posts 172 and 174 and theredistribution post 200 with the lower molding member 182.

Referring to FIG. 12, the lower surface of the lower molding member 182may be removed by a grinding process until the lower end of the secondlower post 174 may be exposed. Because the lower end of the first lowerpost 172 may be lower than the lower end of the second lower post 174,the first lower post 172 may be partially removed by the grindingprocess. As a result, the lower ends of the first and second lower posts172 and 174 and the lower end of the redistribution post 200 may beexposed through the lower surface of the lower molding member 182.

Referring to FIG. 13, a second RDL may be formed on the lower surface ofthe lower molding member 182. The second RDL may be etched to form thesecond redistribution pattern 210. The second redistribution pattern 210may connected to the lower ends of the first and second lower posts 172and 174 and the lower end of the redistribution post 200.

Referring to FIG. 14, the second insulation layer 212 may be formed onthe lower surface of the lower molding member 182 to cover the secondredistribution pattern 210 with the second insulation layer 212. Thesecond insulation layer 212 may be patterned using an exposure processto expose the second redistribution pattern 210.

After removing the carrier substrate 260, a protection layer 230 may beformed on the upper surface of the frame 110. The external terminals 220may be mounted on the second redistribution pattern 210 to complete thefan-out type semiconductor package 100 in FIG. 1.

FIG. 15 is a cross-sectional view illustrating a fan-out typesemiconductor package in accordance with example embodiments, and FIG.16 is a cross-sectional view illustrating a package including a logicchip connected with the fan-out type semiconductor package in FIG. 15.

A fan-out type semiconductor package 100 a of example embodiments mayinclude elements substantially the same as those of the fan-out typesemiconductor package 100 in FIG. 1 except for further including a framepost and a wiring. Thus, the same reference numerals may refer to thesame elements and any further illustrations with respect to the sameelements may be omitted herein for brevity.

Referring to FIG. 15, a frame post 240 may be arranged in the frame 110.

Particularly, the frame post 240 may be vertically arranged in the coreinsulation layer 112 of the frame 110.

The frame post 240 may include an upper end exposed through the uppersurface of the protection layer 230. The frame post 240 may include alower end connected to the first redistribution pattern 190. Thus, theframe post 240 may be electrically connected with the external terminals220 via the first redistribution pattern 190, the redistribution post200 and the second redistribution pattern 210.

The wiring 242 may be formed on the upper surface of the protectionlayer 230. The wiring 242 may be connected to the upper end of the framepost 240. Thus, the wiring 242 may be electrically connected to theexternal terminals 220 via the frame post 240, the first redistributionpattern 190, the redistribution post 200 and the second redistributionpattern 210.

Referring to FIG. 16, when a package 300 including a logic chip 320 maybe arranged under the fan-out type semiconductor package 100 a, heatgenerated from the logic chip 320 may be transferred to the frame post240 and the wiring 242 through the external terminals 220, the secondredistribution pattern 210, the redistribution post 200 and the firstredistribution pattern 190. Thus, the heat may be rapidly dissipatedfrom the fan-out type semiconductor package 100 a. As a result, theframe post 240 and the wiring 242 may function as a heat dissipationpath.

The package 300 may include a frame 310, the logic chip 320, aninsulation layer 330, an upper conductive layer 340, a lower conductivelayer 350 and external terminals 360. The logic chip 320 may be arrangedin a cavity 312 of the frame 310. The frame 310 may include a post 314.

The insulation layer 330 may be formed on an upper surface of the frame310 to fill up the cavity 312. The upper conductive layer 340 may beformed on an upper surface of the insulation layer 330 to electricallyconnect the logic chip 320 with the external terminals 220 of thefan-out type semiconductor package 100. The lower conductive layer 350may be formed on a lower surface of the frame 310. The lower conductivelayer 350 may be electrically connected with the post 314. The externalterminals 360 may be mounted on the lower conductive layer 350.

However, the logic chip 320 may be applied to other packages as well asthe above-mentioned package 300.

FIG. 17 is a cross-sectional view illustrating a fan-out typesemiconductor package in accordance with example embodiments, and FIG.18 is a cross-sectional view illustrating a logic chip applied to thefan-out type semiconductor package in FIG. 17.

Referring to FIG. 17, a fan-out type semiconductor package 100 b ofexample embodiments may be formed by reversing the fan-out typesemiconductor package 100 a in FIG. 15. Thus, the lower chip stack 170may be positioned over the upper chip stack 140. Further, the secondredistribution pattern 210 may correspond to an uppermost layer of thefan-out type semiconductor package 100 b. The wiring 242 may correspondto a lowermost layer of the fan-out type semiconductor package 100 b.The external terminals 220 may be mounted on the wiring 242.

Referring to FIG. 18, a logic chip 270 may be connected with the secondredistribution pattern 210 via conductive bumps 272. A molding member184 may be formed on the upper surface of the second insulation layer212 to cover the logic chip 270. However, the fan-out type semiconductorpackage 100 b may not include the molding member 184.

According to example embodiments, the upper chip stack may be arrangedin the cavity of the frame in the step-like shape and the step-likelower chip stack may also be arranged under the upper chip stack. Thus,the fan-out type semiconductor package may have improved heatdissipation characteristic with a thin thickness.

As is traditional in the field, embodiments may be described andillustrated in terms of blocks which carry out a described function orfunctions. These blocks, which may be referred to herein as units ormodules or the like, are physically implemented by analog and/or digitalcircuits such as logic gates, integrated circuits, microprocessors,microcontrollers, memory circuits, passive electronic components, activeelectronic components, optical components, hardwired circuits and thelike, and may optionally be driven by firmware and/or software. Thecircuits may, for example, be embodied in one or more semiconductorchips, or on substrate supports such as printed circuit boards and thelike. The circuits constituting a block may be implemented by dedicatedhardware, or by a processor (e.g., one or more programmedmicroprocessors and associated circuitry), or by a combination ofdedicated hardware to perform some functions of the block and aprocessor to perform other functions of the block. Each block of theembodiments may be physically separated into two or more interacting anddiscrete blocks without departing from the scope of the disclosure.Likewise, the blocks of the embodiments may be physically combined intomore complex blocks without departing from the scope of the disclosure.An aspect of an embodiment may be achieved through instructions storedwithin a non-transitory storage medium and executed by a processor.

The foregoing is illustrative of example embodiments and is not to beconstrued as limiting thereof. Although a few example embodiments havebeen described, those skilled in the art will readily appreciate thatmany modifications are possible in the example embodiments withoutmaterially departing from the novel teachings and advantages of thepresent invention. Accordingly, all such modifications are intended tobe included within the scope of the present invention as defined in theclaims. In the claims, means-plus-function clauses are intended to coverthe structures described herein as performing the recited function andnot only structural equivalents but also equivalent structures.Therefore, it is to be understood that the foregoing is illustrative ofvarious example embodiments and is not to be construed as limited to thespecific example embodiments disclosed, and that modifications to thedisclosed example embodiments, as well as other example embodiments, areintended to be included within the scope of the appended claims.

What is claimed is:
 1. A fan-out type semiconductor package comprising:a frame including a cavity; an upper chip stack arranged in the cavity;a first redistribution pattern arranged under the frame and electricallyconnected with the upper chip stack; a lower chip stack arranged underthe first redistribution pattern; a second redistribution patternarranged under the lower chip stack and electrically connected with thelower chip stack; and a redistribution post configured to electricallyconnect the first redistribution pattern and the second redistributionpattern to each other, wherein: the upper chip stack comprises: a firstupper chip; and a second upper chip stacked on an upper surface of thefirst upper chip, the second upper chip having a size substantially thesame as a size of the first upper chip, the upper chip stack has astep-like configuration in which the second upper chip is laterallyoffset relative to the first upper chip to expose an edge portion of thesecond upper chip that is not overlapped with the first upper chip andto expose an edge portion of the first upper chip that is not overlappedwith the second upper chip, the first upper chip comprises a first upperpad arranged on a lower surface of the exposed edge portion of the firstupper chip, and the second upper chip comprises a second upper padarranged on a lower surface of the exposed edge portion of the secondupper chip.
 2. The fan-out type semiconductor package of claim 1,further comprising: a first upper post downwardly extended from thefirst upper pad and connected to the first redistribution pattern; and asecond upper post downwardly extended from the second upper pad andconnected to the first redistribution pattern.
 3. The fan-out typesemiconductor package of claim 1, wherein: the second upper chip isstacked on the upper surface of the first upper chip in a pyramidalstep-like shape to expose two adjacent edge portions of the first upperchip, which are not overlapped with the second upper chip, and to exposetwo adjacent edge portions of the second upper chip, which are notoverlapped with the first upper chip, the first upper chip comprisesfirst upper pads arranged on a lower surface of the exposed edgeportions of the first upper chip, and the second upper chip comprisessecond upper pads arranged on a lower surface of the exposed edgeportions of the second upper chip.
 4. The fan-out type semiconductorpackage of claim 1, wherein the lower chip stack comprises: a firstlower chip; and a second lower chip stacked on an upper surface of thefirst lower chip, the second lower chip having a size substantially thesame as a size of the first lower chip.
 5. The fan-out typesemiconductor package of claim 4, wherein: the second lower chip isstacked on the upper surface of the first lower chip in a step-likeshape to expose an edge portion of the first lower chip, which is notoverlapped with the second lower chip, and to expose an edge portion ofthe second lower chip, which is not overlapped with the first lowerchip, the first lower chip comprises a first lower pad arranged on alower surface of the exposed edge portion of the first lower chip, andthe second lower chip comprises a second lower pad arranged on a lowersurface of the exposed edge portion of the second lower chip.
 6. Thefan-out type semiconductor package of claim 5, further comprising: afirst lower post downwardly extended from the first lower pad andconnected to the second redistribution pattern; and a second lower postdownwardly extended from the second lower pad and connected to thesecond redistribution pattern.
 7. The fan-out type semiconductor packageof claim 4, wherein: the second lower chip is stacked on the uppersurface of the first lower chip in a pyramidal step-like shape to exposetwo adjacent edge portions of the first lower chip, which are notoverlapped with the second lower chip, and to expose two adjacent edgeportions of the second lower chip, which are not overlapped with thefirst lower chip, the first lower chip comprises first lower padsarranged on a lower surface of the exposed edge portions of the firstlower chip, and the second lower chip comprises second lower padsarranged on a lower surface of the exposed edge portions of the secondlower chip.
 8. The fan-out type semiconductor package of claim 1,further comprising: a frame post arranged in the frame and electricallyconnected with the redistribution post; and a wiring arranged over theframe and electrically connected with the frame post.
 9. The fan-outtype semiconductor package of claim 8, further comprising: an externalterminal arranged on the wiring; and a logic chip arranged on the secondredistribution pattern.
 10. The fan-out type semiconductor package ofclaim 1, further comprising: an upper molding member arranged on thefirst redistribution pattern to support the upper chip stack; and alower molding member arranged on the second redistribution pattern tosupport the lower chip stack.
 11. A fan-out type semiconductor packagecomprising: a frame including a cavity; an upper chip stack including afirst upper chip arranged in the cavity, a second upper chip stacked onan upper surface of the first upper chip in a step-like shape to exposean edge portion of the first upper chip, which is not overlapped withthe second upper chip, and to expose an edge portion of the second upperchip, which is not overlapped with the first upper chip, wherein: thefirst upper chip comprises a first upper pad arranged on a lower surfaceof the exposed edge portion of the first upper chip, the second upperchip includes a second upper pad arranged on a lower surface of theexposed edge portion of the second upper chip, and the second upper chiphas a size substantially the same as a size of the first upper chip; afirst redistribution pattern arranged under the frame; a first upperpost downwardly extended from the first upper pad and connected to thefirst redistribution pattern; a second upper post downwardly extendedfrom the second upper pad and connected to the first redistributionpattern; an upper molding member arranged on the first redistributionpattern to support the upper chip stack and the first and second upperposts; a lower chip stack including a first lower chip arranged underthe first redistribution pattern, a second lower chip stacked on anupper surface of the first lower chip in a step-like shape to expose anedge portion of the first lower chip, which is not overlapped with thesecond lower chip, and to expose an edge portion of the second lowerchip, which is not overlapped with the first lower chip, wherein: thefirst lower chip includes a first lower pad arranged on a lower surfaceof the exposed edge portion of the first lower chip, the second lowerchip includes a second lower pad arranged on a lower surface of theexposed edge portion of the second lower chip, and the second lower chiphas a size substantially the same as a size of the first lower chip; asecond redistribution pattern arranged under the lower chip stack; afirst lower post downwardly extended from the first lower pad andconnected to the second redistribution pattern; a second lower postdownwardly extended from the second lower pad and connected to thesecond redistribution pattern; a redistribution post configured toelectrically connect the first redistribution pattern and the secondredistribution pattern with each other; and a lower molding memberarranged on the second redistribution pattern to support the lower chipstack, the first and second lower posts, and the redistribution post.12. The fan-out type semiconductor package of claim 11, wherein: thesecond upper chip is stacked on the upper surface of the first upperchip in a pyramidal step-like shape to expose two adjacent edge portionsof the first upper chip, which are not overlapped with the second upperchip, and to expose two adjacent edge portions of the second upper chip,which are not overlapped with the first upper chip, and the second lowerchip is stacked on the upper surface of the first lower chip in apyramidal step-like shape to expose two adjacent edge portions of thefirst lower chip, which are not overlapped with the second lower chip,and to expose two adjacent edge portions of the second lower chip, whichare not overlapped with the first lower chip.
 13. The fan-out typesemiconductor package of claim 11, further comprising: a frame postarranged in the frame and electrically connected with the redistributionpost; a wiring arranged over the frame and electrically connected withthe frame post; an external terminal arranged on the wiring; and a logicchip arranged on the second redistribution pattern.